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FocusMonitor FM+
4.1
Measuring principle
The FM+ is an opto-mechanically scanning measuring system
The laser beam is scanned using a specialized measuring tip. A small pin hole (typical diameter: 25 μm) in
the measuring tip samples a small part of the laser beam. The sampled part of the laser beam is guided onto
a detector element
The detector is selected depending on the wavelength of the laser radiation to be measured. In this way,
different laser beam sources and systems can be measured by optimally selecting the measuring tip and the
associated detector.
The high angular velocity of the rotating measuring tip allows the analysis of high power densities.
Due to the dynamics of the analog-to-digital converters used, a very good signal-to-noise ratio is achieved.
Very low intensities as well as high peak intensities are recorded with equal precision.
This is one of the requirements for the automatic measurement of caustics in the near-focus range over at
least four Rayleigh lengths in accordance with ISO 11146.
Fig. 4.2:
Optomechanical design FM+
4.2
Status Display
The status display consists of a light ring that uses different colors and static or rotating lights to indicate different
statuses of the FM+.
Color
White
Yellow
Red
Tab. 4.1:
States of status display
Revision 08 EN - 08/2023
Laser beam
z
x
y
Measuring tip
Lighting state
The entire ring is lit
Rotating light
Rotating light
Detector
Meaning
The supply voltage is connected
The measuring tip is rotating and the different rotational
speeds are indicated.
The measuring tip rotating and the y-axis is moving.
The measurement is in progress, the different rotational
speeds are indicated.
13
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